Stormwater ponds are engineered basins designed to have a permanent pool of water (wet ponds) or to dry up after a couple of days (dry ponds). Stormwater ponds prevent flooding and remove pollutants in order to reduce impacts to lakes, streams, and wetlands.
Stormwater ponds help prevent flooding by slowing the rate water enters the receiving water bodies and storm sewer system. They capture and hold a prescribed volume of runoff for a specific period of time or until it is displaced by the next storm. During this time, particles and associated pollutants settle to the bottom of the pond. Plants in and around the pond help remove pollutants through biological processes.
City of Roseville staff inspects stormwater ponds on a rotating basis, and complete follow up inspections as needed. Routine inspections and maintenance ensure the stormwater ponds are functioning as designed, and are treating stormwater to protect our lakes. Staff inspect for:
Inlet & Outlet functionality
Once enough sediment accumulates in a pond, the City contracts to remove the sediment and bring the pond back to its original design. Typically the pond is dewatered which makes it feasible for a backhoe to excavate the sediment. The excavated material is then hauled off to an approved site for disposal. Any disturbed area (excluding the bottom) is seeded with an appropriate mix and then covered with an erosion control blanket to reduce the possibility of any erosion.